University of Minnesota

Displaying 81-112 of 112 results

  • White Papers // Dec 2009

    Random Walks on Digraphs: A Theoretical Framework for Estimating Transmission Costs in Wireless Routing

    Due to the unique characteristics of wireless technologies and the dynamics in the environments (e.g., Mobility and interference) they operate in, wireless channels are known to be time-varying, unreliable, and asymmetric. Furthermore, wireless networks are often designed to support certain applications or missions, and deployed in specific environments. For these...

    Provided By University of Minnesota

  • White Papers // Dec 2009

    S-MED: Sarcoma MicroRNA Expression Database

    Human sarcomas are a heterogeneous group of over 50 different malignant tumors for which very few diagnostic markers currently exist. MicroRNA (miRNA) transcript levels have been proposed for use in the diagnosis, classification and prognosis of tumors. Over 700 miRNAs are identified in humans and miRNA are considered attractive candidates...

    Provided By University of Minnesota

  • White Papers // Dec 2009

    Examining Return On Human Capital Investments In The Context Of Offshore IT Workers

    The rapid pace of technological innovation necessitates Information Technology (IT) services firms to continually invest in replenishing the skills of their key asset base, the human capital. Controlling for unobservable employee characteristics and possible selection bias, one find significant a positive impact of training on employee performance. An additional training...

    Provided By University of Minnesota

  • White Papers // Dec 2009

    Starling: Minimizing Communication Overhead in Virtualized Computing Platforms Using Decentralized Affinity-Aware Migration

    Virtualization is being widely used in large-scale computing environments, such as clouds, data centers, and grids, to provide application portability and facilitate resource multiplexing while retaining application isolation. In many existing virtualized platforms, it has been found that the network bandwidth often becomes the bottleneck resource, causing both high network...

    Provided By University of Minnesota

  • White Papers // Dec 2009

    Global Budgets And Excess Demand For Hospital Care

    Excess demand is a pervasive feature of health care systems that use global budgets to pay for hospital care, regardless of the amount of money spent by those systems. This paper presents a theory that explains this feature of global budgets. The theory emphasizes that hospital administrators control the allocation...

    Provided By University of Minnesota

  • White Papers // Nov 2009

    Flexible Decision Support in Dynamic Inter-organizational Networks

    An effective Decision Support System (DSS) should help its users improve decision-making in complex, information-rich, dynamic environments. The authors present a feature gap analysis of current decision support technologies, and they identify a set of DSS Desiderata, properties that can contribute both effectiveness and flexibility to users in such environments....

    Provided By University of Minnesota

  • White Papers // Oct 2009

    The Economic Impact of Wireless Number Portability

    This paper examines the price response of wireless carriers to the introduction of number portability. The authors find that wireless prices decreased in response to number portability, but not uniformly across plans. Average prices for the plans with the fewest minutes decreased by only $0.19/month (0.97%), but average prices for...

    Provided By University of Minnesota

  • White Papers // Oct 2009

    Virtual Scanning Algorithm for Road Network Surveillance

    This paper proposes a VIrtual Scanning Algorithm (VISA), tailored and optimized for road network surveillance. The authors' design uniquely leverages upon the facts that the movement of targets (e.g., vehicles) is confined within roadways and the road network maps are normally known. They guarantee the detection of moving targets before...

    Provided By University of Minnesota

  • White Papers // Sep 2009

    3D Reconstruction of Periodic Motion From a Single View

    Periodicity has been recognized as an important cue for tasks like activity recognition and gait analysis. However, most existing techniques analyze periodic motions only in image coordinates, making them very dependent on the viewing angle. In this paper, the authors show that it is possible to reconstruct a periodic trajectory...

    Provided By University of Minnesota

  • White Papers // Sep 2009

    Joint Transmitter and Receiver Carrier Sensing Capability of CSMA in MANETs

    This paper considers the performance of the CSMA protocol with joint transmitter-receiver sensing in a wireless mobile ad hoc network. In the authors' network model, packets belonging to specific transmitters arrive randomly in space and time according to a 3-D Poisson point process, and are then transmitted to their intended...

    Provided By University of Minnesota

  • White Papers // Sep 2009

    Cash Flow Risk Ratio: An Aid To Marketing Decisions

    Financial risk differs from the business risks previously described in that it results from the way the firm's capital is obtained and financed. A producer may be subject to fluctuations in interest rates on borrowed capital, or face cash flow difficulties if there are insufficient funds to repay creditors. The...

    Provided By University of Minnesota

  • White Papers // Sep 2009

    A Multi-Robot System for Unconfined Video-Conferencing

    Telepresence or tele-immersion technologies allow people to attend a shared meeting without being physically present in the same location. Commercial telepresence solutions available in the market today have significant drawbacks - they are very expensive, and confine people to the area covered by stationary cameras. This paper presents a mobile...

    Provided By University of Minnesota

  • White Papers // Sep 2009

    Multi-Type Nearest Neighbor Queries Road Networks With Time Window Constraints

    A Multi-Type Nearest Neighbor (MTNN) query finds the shortest tour for a given query point and different types of spatial features such that only one instance of each feature is visited during the tour. In a real life MTNN query a user normally needs an answer with specific start time...

    Provided By University of Minnesota

  • White Papers // Sep 2009

    ESC: Energy Synchronized Communication in Sustainable Sensor Networks

    With advances in energy harvesting techniques, it is now feasible to build Sustainable Sensor Networks (SSN) to support long-term applications. Unlike battery-powered sensor networks, the objective of sustainable sensor networks is to effectively utilize a continuous stream of ambient energy. Instead of pushing the limits of energy conservation, the authors...

    Provided By University of Minnesota

  • White Papers // Sep 2009

    Spatiotemporal Delay Control for Low-Duty-Cycle Sensor Networks

    Data delivery is a major function of sensor network applications. Many applications, such as military surveillance, require the detection of interested events to be reported to a command center within a specified time frame, and therefore impose a real-time bound on communication delay. On the other hand, to conserve energy,...

    Provided By University of Minnesota

  • White Papers // Sep 2009

    Anomaly Detection : A Survey

    "Anomaly detection is an important problem that has been researched within diverse research areas and application domains. Many anomaly detection techniques have been specifically developed for certain application domains, while others are more generic. This survey tries to provide a structured and comprehensive overview of the research on anomaly detection....

    Provided By University of Minnesota

  • White Papers // Sep 2009

    Mendel Versus Malthus: Research, Productivity And Food Prices In The Long Run

    Over the past 50 years and longer, the supply of food commodities has grown faster than the effective market demand, in spite of increasing population and per capita incomes. Consequently, the real (deflated) prices of food commodities have steadily trended down. The past increases in agricultural productivity and production, and...

    Provided By University of Minnesota

  • White Papers // Aug 2009

    Extracting the Textual and Temporal Structure of Supercomputing Logs

    Supercomputers are prone to frequent faults that adversely affect their performance, reliability and functionality. System logs collected on these systems are a valuable resource of information about their operational status and health. However, their massive size, complexity, and lack of standard format makes it difficult to automatically extract information that...

    Provided By University of Minnesota

  • White Papers // Aug 2009

    An Examination Of Quality Management In Support Functions Of Elementary And Secondary Education Using The Malcolm Baldrige National Quality Awards Criteria For Performance Excellence

    Student learning, the primary outcome of the education process, is another important measure of quality. Learning among elementary and secondary students is monitored at the national level through the achievement test known as the National Assessment of Educational Progress. Trend data suggests that achievement growth among students has stagnated despite...

    Provided By University of Minnesota

  • White Papers // Jul 2009

    IP-Geolocation Mapping for Involving Moderately-Connected Internet Regions

    Current IP-geolocation mapping schemes primarily take delay-measurement approach, and most of them are based on the assumption of a strong correlation between networking delay and geographical distance between the targeted client and the landmarks. In this paper, however, the authors investigate a large region of the Internet and find the...

    Provided By University of Minnesota

  • White Papers // Jul 2009

    Interaction, Competition and Innovation in a Service-Oriented Internet: An Economic Model

    This paper presents a new economic approach for studying competition and innovation in a complex and highly interactive system of network providers, users, and suppliers of digital goods and services (i.e., service providers). It employs Cournot and Bertrand games to model the competition among service providers and among network providers,...

    Provided By University of Minnesota

  • White Papers // Jul 2009

    Retail And Wholesale Market Power In Organic Foods

    The demand for organic fresh fruits and vegetable continues to grow at a rate far higher than the rest of the produce industry. The cost of meeting organic certification standards, however, has meant that supply has been slow to adjust. With limited supply, the authors hypothesize that organic suppliers enjoy...

    Provided By University of Minnesota

  • White Papers // Jul 2009

    Multi-User Diversity Vs. Accurate Channel State Information in MIMO Downlink Channels

    In a multiple transmit antenna, single antenna per receiver downlink channel with limited channel state feedback, the authors consider the following question: given a constraint on the total system-wide feedback load, is it preferable to get low-rate/coarse channel feedback from a large number of receivers or high-rate/high-quality feedback from a...

    Provided By University of Minnesota

  • White Papers // Jun 2009

    HiDRA: Statistical Multi-Dimensional Resource Discovery for Large-Scale Systems

    Resource discovery enables applications deployed in heterogeneous large-scale distributed systems to find resources that meet QoS requirements. In particular, most applications need resource requirements to be satisfied simultaneously for multiple resources (such as CPU, memory and network bandwidth). Due to dynamism in many large-scale systems, providing statistical guarantees on such...

    Provided By University of Minnesota

  • White Papers // May 2009

    Exploring In-Situ Sensing Irregularity in Wireless Sensor Networks

    The circular sensing model has been widely used to estimate performance of sensing applications in existing analyses and simulations. While this model provides valuable high-level guidelines, the quantitative results obtained may not reflect the true performance of these applications, due to the sensing irregularity introduced by existence of obstacles in...

    Provided By University of Minnesota

  • White Papers // May 2009

    Using Proxies to Accelerate Cloud Applications

    A rich cloud ecosystem is unfolding with clouds emerging to provide platforms and services of many shapes and sizes. The authors speculate that future network applications may wish to utilize and synthesize capabilities from multiple clouds. The problem is this may entail significant data communication that derives from the client-server...

    Provided By University of Minnesota

  • White Papers // May 2009

    Nebulas: Using Distributed Voluntary Resources to Build Clouds

    Current cloud services are deployed on well provisioned and centrally controlled infrastructures. However, there are several classes of services for which the current cloud model may not fit well: some do not need strong performance guarantees, the pricing may be too expensive for some, and some may be constrained by...

    Provided By University of Minnesota

  • White Papers // May 2009

    Virtual Putty: Reshaping the Physical Footprint of Virtual Machines

    Virtualization is a key technology underlying cloud computing platforms, where applications encapsulated within virtual machines are dynamically mapped onto a pool of physical servers. In this paper, the authors argue that cloud providers can significantly lower operational costs, and improve hosted application performance, by accounting for affinities and conflicts between...

    Provided By University of Minnesota

  • White Papers // Apr 2009

    Impact of Fading on the Performance of ALOHA and CSMA

    This paper considers the performance of the ALOHA and CSMA MAC protocols in wireless ad hoc networks in the presence of fading. Increasing the rate of successful reception of packets is the authors' objective, and thus, outage probability is used as the performance evaluation metric. In their network model, packets...

    Provided By University of Minnesota

  • White Papers // Jan 2005

    Fertility And Social Security

    The data show that an increase in government provided old-age pensions is strongly correlated with a reduction in fertility. What type of model is consistent with this finding? We explore this question using two models of fertility, the one by Barro and Becker (1989), and the one inspired by Caldwell...

    Provided By University of Minnesota

  • White Papers // Jun 2003

    The Effectiveness and Safety of Traffic and Non-Traffic Related Messages Presented on Changeable Message Signs (CMS)

    This report discusses two experiments investigating Changeable Message Signs (CMS). The objectives of this study were to determine whether or not CMS messages really work, whether or not CMS messages cause traffic slow-downs, the likely impact of CMS messages on traffic flow, and whether or not messages should be presented...

    Provided By University of Minnesota

  • White Papers // Jan 2003

    Negotiation, Supply Management, And Farm Income

    Negotiating and supply management are two important marketing tools for farmers to consider. The two strategies are commonly used in business. They work in different ways, however. To get a feeling for how they are different, consider a common experience we have all had, that of buying a car. Surely,...

    Provided By University of Minnesota

  • White Papers // Mar 2011

    Dynamic Outsourcing Mobile Computation to the Cloud

    Mobile devices are becoming the universal interface to online services and cloud computing applications. Since mobile phones have limited computing power and battery life, there is a potential to migrate computation intensive application components to external computing resources. The Cloud is an attractive platform for offloading due to elastic resource...

    Provided By University of Minnesota

  • White Papers // Sep 2009

    ESC: Energy Synchronized Communication in Sustainable Sensor Networks

    With advances in energy harvesting techniques, it is now feasible to build Sustainable Sensor Networks (SSN) to support long-term applications. Unlike battery-powered sensor networks, the objective of sustainable sensor networks is to effectively utilize a continuous stream of ambient energy. Instead of pushing the limits of energy conservation, the authors...

    Provided By University of Minnesota

  • White Papers // Oct 2009

    Virtual Scanning Algorithm for Road Network Surveillance

    This paper proposes a VIrtual Scanning Algorithm (VISA), tailored and optimized for road network surveillance. The authors' design uniquely leverages upon the facts that the movement of targets (e.g., vehicles) is confined within roadways and the road network maps are normally known. They guarantee the detection of moving targets before...

    Provided By University of Minnesota

  • White Papers // Jul 2011

    Safeguarding Schedule Updates in Wireless Sensor Networks

    Working in the duty cycling mode enables sensor nodes to utilize limited energy efficiently instead of unnecessary idle listening. In such networks, awareness of neighboring nodes' working schedules is essential, especially when each node sets up the schedule independently. Most traditional research assumes that a node can always share its...

    Provided By University of Minnesota

  • White Papers // Oct 2010

    Dynamic Switching-Based Data Forwarding for Low-Duty-Cycle Wireless Sensor Networks

    In this paper, the authors introduce the concept of Dynamic Switch-based Forwarding (DSF) that optimizes the expected data delivery ratio, expected communication delay, or expected energy consumption for low-duty-cycle wireless sensor networks under unreliable communication links. DSF is designed for networks with possibly unreliable communication links and predetermined node communication...

    Provided By University of Minnesota

  • White Papers // May 2009

    Exploring In-Situ Sensing Irregularity in Wireless Sensor Networks

    The circular sensing model has been widely used to estimate performance of sensing applications in existing analyses and simulations. While this model provides valuable high-level guidelines, the quantitative results obtained may not reflect the true performance of these applications, due to the sensing irregularity introduced by existence of obstacles in...

    Provided By University of Minnesota

  • White Papers // Aug 2011

    Correlated Flooding in Low-Duty-Cycle Wireless Sensor Networks

    Flooding in low-duty-cycle wireless sensor networks is very costly due to asynchronous schedules of sensor nodes. To adapt existing flooding-tree-based designs for low-duty-cycle networks, the authors shall schedule nodes of common parents wake up simultaneously. Traditionally, energy optimality in a designated flooding-tree is achieved by selecting parents with the highest...

    Provided By University of Minnesota

  • White Papers // May 2010

    Bounding Communication Delay in Energy Harvesting Sensor Networks

    In energy-harvesting sensor networks, limited ambient energy from environment necessitates sensor nodes to operate at a low-duty-cycle, i.e., they communicate briefly and stay asleep most of time. Such low-duty-cycle operation leads to orders of magnitude longer communication delays in comparison with traditional always-active networks, imposing a new challenge in many...

    Provided By University of Minnesota

  • White Papers // Sep 2009

    Spatiotemporal Delay Control for Low-Duty-Cycle Sensor Networks

    Data delivery is a major function of sensor network applications. Many applications, such as military surveillance, require the detection of interested events to be reported to a command center within a specified time frame, and therefore impose a real-time bound on communication delay. On the other hand, to conserve energy,...

    Provided By University of Minnesota

  • White Papers // Jan 2010

    Stochastic Cross-Layer Resource Allocation for Wireless Networks Using Orthogonal Access: Optimality and Delay Analysis

    Efficient design of wireless networks requires implementation of cross-layer algorithms that exploit channel state information. Capitalizing on convex optimization and stochastic approximation tools, this paper develops a stochastic algorithm that allocates resources at network, link, and physical layers so that a sum-utility of the average end-to-end rates is maximized. Focus...

    Provided By University of Minnesota

  • White Papers // Apr 2009

    Impact of Fading on the Performance of ALOHA and CSMA

    This paper considers the performance of the ALOHA and CSMA MAC protocols in wireless ad hoc networks in the presence of fading. Increasing the rate of successful reception of packets is the authors' objective, and thus, outage probability is used as the performance evaluation metric. In their network model, packets...

    Provided By University of Minnesota

  • White Papers // Sep 2009

    Joint Transmitter and Receiver Carrier Sensing Capability of CSMA in MANETs

    This paper considers the performance of the CSMA protocol with joint transmitter-receiver sensing in a wireless mobile ad hoc network. In the authors' network model, packets belonging to specific transmitters arrive randomly in space and time according to a 3-D Poisson point process, and are then transmitted to their intended...

    Provided By University of Minnesota

  • White Papers // Mar 2010

    Efficient Evaluation of K-Range Nearest Neighbor Queries in Road Networks

    A k-Range Nearest Neighbor (or kRNN for short) query in road networks finds the k nearest neighbors of every point on the road segments within a given query region based on the network distance. The kRNN query is significantly important for location-based applications in many realistic scenarios. For example, the...

    Provided By University of Minnesota

  • White Papers // Apr 2011

    Liquidsoap: A High-Level Programming Language for Multimedia Streaming

    Generating multimedia streams, such as in a netradio, is a task which is complex and difficult to adapt to every users' needs. The authors introduce a novel approach in order to achieve it, based on a dedicated high-level functional programming language, called Liquid-soap, for generating, manipulating and broadcasting multimedia streams....

    Provided By University of Minnesota

  • White Papers // Feb 2011

    A Geometric Approach to Robustness in Complex Networks

    Unlike traditional studies on network robustness, that typically treat networks as combinatoric objects and rely primarily on classical graph-theoretic concepts (e.g. minimum cuts) to characterize network robustness, the authors explore a geometric approach which enables one to employ more advanced theories and techniques, quantify and compare robustness of networks in...

    Provided By University of Minnesota

  • White Papers // Apr 2011

    The Routing Continuum From Shortest-Path to All-Path: A Unifying Theory

    Routing is a critical operation in many types of networks from communication networks to transportation networks. For instance, in modern IP-based data networks, shortest path routing is most commonly used. In traditional telecommunication networks, dynamic alternative routing strategies that employ paths that are longer than shortest paths have been also...

    Provided By University of Minnesota

  • White Papers // Apr 2011

    Flat Versus Metered Rates, Bundling, and "Bandwidth Hogs"

    The current push for bandwidth caps, tiered usage pricing, and other measures in both wireless and wireline communications is usually justified by invoking the specter of "Bandwidth hogs" consuming an unfair share of the transmission capacity and being subsidized by the bulk of the users. This paper presents a conventional...

    Provided By University of Minnesota

  • White Papers // Feb 2011

    Simplifying Manageability, Scalability and Host Mobility in Large-Scale Enterprise Networks Using VEIL-Click

    The explosive growth in the network driven services and devices is causing existing networks to continually expand to accommodate the demands set by them. However, underlying network architecture can not sustain this continual expansion. As a result, several ad-hoc mechanisms are used as workarounds, which make the networks increasingly complicated...

    Provided By University of Minnesota

  • White Papers // Jan 2011

    Making Sense of Customer Tickets in Cellular Networks

    Effective management of large-scale cellular data networks is critical to meet customer demands and expectations. Customer calls for technical support provide direct indication as to the problems customers encounter. In this paper, the authors study the customer tickets - free-text recordings and classifications by customer support agents - collected at...

    Provided By University of Minnesota

  • White Papers // Jan 2011

    Un-Zipping Cellular Infrastructure Locations Via User Geo-Intent

    Despite the rapid growth in cellular data traffic, the authors know very little about the (operational) Cellular Data Service Network (CDSN) infrastructure. A key step in the process of developing any such understanding is to first understand the locations and distribution of the base-stations in the CDSN infrastructure that serve...

    Provided By University of Minnesota

  • White Papers // Nov 2010

    HOSPITAL: Host and Network System Profiler and Internet Traffic Analyzer

    The ever-increasing complexity and diversity of the Internet pose several challenges to network operators and administrators and, in general, Internet users. More specifically, because of the diversity in applications and usage patterns; the prevalence of dynamic IP addresses and applications that do not conform to standard configuration (e.g. VoIP to...

    Provided By University of Minnesota

  • White Papers // Feb 2010

    Inferring Applications at the Network Layer Using Collective Traffic Statistics

    Operating, managing and securing networks require a thorough understanding of the demands placed on the network by the endpoints it interconnects, the characteristics of the traffic the endpoints generate, and the distribution of that traffic over the resources of the network infrastructure. A major differentiator in the types of resource...

    Provided By University of Minnesota

  • White Papers // Mar 2010

    Sifting Through Network Data to Cull Activity Patterns With HEAPs

    Today's large campus and enterprise networks are characterized by their complexity, i.e. containing thousands of hosts, and diversity, i.e. with various applications and usage patterns. To effectively manage and secure such networks, network operators and system administrators are faced with the challenge of characterizing, profiling and tracking activity patterns passing...

    Provided By University of Minnesota

  • White Papers // Jul 2009

    Interaction, Competition and Innovation in a Service-Oriented Internet: An Economic Model

    This paper presents a new economic approach for studying competition and innovation in a complex and highly interactive system of network providers, users, and suppliers of digital goods and services (i.e., service providers). It employs Cournot and Bertrand games to model the competition among service providers and among network providers,...

    Provided By University of Minnesota

  • White Papers // May 2011

    Bubble Trace: Mobile Target Tracking Under Insufficient Anchor Coverage

    As an essential requirement for surveillance systems, target tracking has been studied extensively. Most of the tracking schemes are based on trilateration, which requires each point in the monitoring area to be covered by at least three anchors. However, due to the inadequate deployment of costly anchors and environment constraints,...

    Provided By University of Minnesota

  • White Papers // Jan 2011

    On-Demand Time Synchronization With Predictable Accuracy

    Time synchronization remains as a challenging task in wireless sensor networks that face severe resource constraints. Unlike previous work's aiming at pure clock accuracy, this paper proposes On-Demand Synchronization (ODS), a design to achieve efficient clock synchronization with customized performance. By carefully modeling the error uncertainty of skew detection and...

    Provided By University of Minnesota

  • White Papers // May 2012

    Recovery of Low-Rank Plus Compressed Sparse Matrices With Application to Unveiling Traffic Anomalies

    Given the superposition of a low-rank matrix plus the product of a known fat compression matrix times a sparse matrix, the goal of this paper is to establish deterministic conditions under which exact recovery of the low-rank and sparse components becomes possible. This fundamental identifiability issue arises with traffic anomaly...

    Provided By University of Minnesota

  • White Papers // May 2011

    Sparsity-Aware Kalman Tracking of Target Signal Strengths on a Grid

    Tracking multiple moving targets is known to be challenged by the nonlinearity present in the measurement equation, and by the computationally burdensome data association task. This paper introduces a grid-based model of target signal strengths leading to linear state and measurement equations, that can afford state estimation via sparsity-aware Kalman...

    Provided By University of Minnesota

  • White Papers // Apr 2012

    Dynamic Network Delay Cartography

    Path delays in IP networks are important metrics, required by network operators for assessment, planning, and fault diagnosis. Monitoring delays of all source-destination pairs in a large network is however challenging and wasteful of resources. The paper advocates a spatio-temporal Kalman filtering approach to construct network-wide delay maps using measurements...

    Provided By University of Minnesota

  • White Papers // Apr 2011

    The Natural Resource Decision Support System (NRDSS): Creation of a 9.2 ArcGIS Server Website and a SQL Server 2005 ArcSDE 9.2 Database for the Minnesota Board of Water and Soil Resources (BWSR)

    In the fall of 2007, GeoSpatial Services (GSS) accepted a contract from the Minnesota Board of Water and Soil Resources (BWSR) to develop a 9.2 ArcGIS Server application. This application was to be a web mapping site that would support Soils SURvey GeOgraphic Database (SSURGO) soils data interaction and allow...

    Provided By University of Minnesota

  • White Papers // Mar 2012

    Scalable Transaction Management With Snapshot Isolation on Cloud Data Management Systems

    Key-value based data storage systems such as HBase and Bigtable provide high scalability compared to traditional relational databases, however, they provide only limited transactional functionality, such as single-row transactions. The authors address the problem of building scalable transaction management mechanisms for multi-row transactions on key-value storage systems. They develop scalable...

    Provided By University of Minnesota

  • White Papers // Mar 2010

    Coding Versus ARQ in Fading Channels: How reliable should the PHY be?

    This paper studies the tradeoff between channel coding and ARQ (Automatic Repeat reQuest) in Rayleigh block-fading channels. A heavily coded system corresponds to a low transmission rate with few ARQ re-transmissions, whereas lighter coding corresponds to a higher transmitted rate but more retransmissions. The optimum error probability, where optimum refers...

    Provided By University of Minnesota